Fog-horn



(No Model.)

W. LE BLANC. FOG HORN No. 454,280. PatentedJune 16,1891.

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-- UNITED STATES .PATENT OFFICE.

WILLIAM'LE .BLANC, oFjBos'roN, MASSACHUSETTS. Y

FOG-HORN.

SPECIFICATION forming partof L etters Patent No. 454,280, dated June 16, 1891.

' Application filed December29, 1890. Serial No. 376,041. No model.)

To all whom, it may concern:

Be it known that I, WVILLIAM LE BLANO, of Boston, in the county of Suffolk and State of Massachusetts, have invented certain new and useful Improvements in Fog-Horns, of which the following is a specification.

This invention relates to fog-horns; and it has for its object to provide a fog-horn which shall be capable of producing a large volume of sound and of being heard a long distance The invention consists in the combination, with achamber or casing having an induction passage or passages at one end and a partition or head atthe other end, of a plurality of tongued fines or sounders arranged in said chamber and a relief-outlet provided with a yielding valve, whereby the pressure in said chamber may be automatically reduced, all of which I will now proceed todescribe.

Of the accompanying drawings, forming a part of this specification, Figure 1- represents a longitudinal section of, my improved foghorn, only a small part of the trumpet being shown. Fig. 2 represents a section on line 2 2 of Fig. 1, looking toward the left. Fig. 3 represents a front view, and Fig. 4 a side View, of one of the tongued fines which are used in my improved fog-horn.

The same letters indicate the same parts in all the figures.

In the drawings, a represents a cylindrical chamber or casing,preferablyof inetal,which is closed at one end, with theexception of an induction port or ports. Z) I) represent said induction-ports, of which there may be one or more, as may be preferred, said ports communicating with a pipe I), through which steam or compressed air enters the chamber a. The chamber a is closed at its other end by a partition or head 0. As shown in the drawings, the casing a is screw-threaded at its end, and the head 0 is screw-threaded on one portion of its periphery to fit said casing. The central portion of the periphery of said head is preferably of the octagonal form shown in Fig. 2, and the remaining portion of its periphery is screw-threaded to receive the end of asuitable trumpet c. It will beseen that the central portion of the periphery of Y the head 0 forms a projection against which the casing 0'. can be screwed tight on one side and the trumpet on the other side.

01 d represent fines which are closed at one end and are open at the other end and along one side. Said fines are provided on their open sides with tongues f, which are fastened to projecting flanges d on the fines (Z by screws f, passing through astrip f of metal and through flanges or cars f on the ton gues f.

The fines d,with their tongues f, are placed inthe casing a and are set in the head 0 with their open ends projecting slightly beyond the same. The head 0 is provided with holes adapted to fit closely the fines (Z and tongues f. To insure a tight joint, I provide the said fines with a flange or rib d projecting therefrom, which is adapted to rest upon the inner side of the head 0, and I provide tongue f with arecess f to receive the edge of the head and to fit tightly thereon. The tongues f are sprung slightly out from the tines d, so as to form vibrating tongues, which will vibrate whensteam orcompressed airisforced through the said fines, as hereinafter described.

g represents an outlet or relief port, which is adapted to let off superfluous steam or air when the pressure in the chamber a becomes too great. The outlet-port g is provided with a valve h, which is supported against the pressure in the chamber a by a spring 2'.

j represents a screw passing through the end of the tube g and pressing against one end of the spring 2', the other end of said spring pressing against the valve 72..

The outlet-tube g is provided with openings g g, and the valve h is supported by the spring 2' against the pressure in the chamber a, so as to close said openings, a stop 7s being provided across the tube 9 to prevent the valve h from being pushed too far into the tube g by the spring 'i.

The operation of the horn is as follows: The compressed fluid entering the chamber a by the induction-ports b 1) passes out of the same through the fines (Z, vibrating the tongues and producing a large volume of sound. If the pressure in the chamber abecomes too great and holds the tongues f down on the fines, thus stopping the sound, the

pressure will be relieved by the exit of the compressed fluid through the port The spring i may be so adjusted by means of the screw j as to let off the compressed fluid at any desired pressure. The extra pressure being relieved, the tongues f will spring out to their normal position, the outlet-valve will close, and the compressed fluid will again pass through the flues (Z, vibrating the tongues f and producing sound.

The outlet-tube g is preferably screwed into the head 0, as shown in Fig. 1.

Four flues cl are shown in the drawings arranged in the casing a; butI do not limitmyself to the number or exact arrangement of the flues d employed in said casing.

1. In a fog-horn, the combination of a casing or chamber having an induction port or ports, a plurality of tongued dues or whistles arranged in said chamber and having their open ends projecting through one end there of, and a relief-outlet provided with a yielding valve, whereby overpressure in said chamber is prevented, as set forth.

2. In a fog-horn, the combination of the chamber at, having an induction passage or passages I) and the partition or head 0, a plurality of flues (l, secured to said partition, each flue being closed at one end and open along one side and at the other end and provided with a tongue secured to the open end and free to vibrate over the open side and closed end, and a relief-outlet provided with a yielding valve, whereby the pressure in said chamber maybe automatically reduced, as set forth.

3. In a fog-horn, the combination of the casing or chamber a, having an induction passage or passages b and the partition or head 0, a plurality of dues d in said chamber secured to said partition, each flue being closed at one end and open at the other end and along one side and having its open end projecting through the head 0, each flue being provided with a tongue f, secured to the open end and free to vibrate over the open side and closed end thereof, each tongue f being provided with flanges f corresponding with projecting flangesd' on the flues d, said tongues f being secured to the dues by fastenings passing through said flanges f and d, the relief-outlet q, provided with the ports g, the valve h, and means for yieldingly supporting the same, so that under a given pressure in the chamber (b said valve will close the ports in said outlet and will yield under a greater pressure to open said ports and relieve the pressure, as set forth.

In testimony whereof I have signed my name to this specification, in the presence of two subscribing witnesses, this 19th day of December, A. D. 1890.

WILLIAM LE BLANC.

Vsitnesses:

EWING W. HAMLEN, ARTHUR W. ORossLuY. 

